Merge pull request #1656 from pguyot/w19/fix-smp-cpp

Fix compilation of smp.h with C++ and disabled SMP

These changes are made under both the "Apache 2.0" and the "GNU Lesser General
Public License 2.1 or later" license terms (dual license).

SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later

Author: bettio

src/libAtomVM/smp.h

@@ -273,6 +273,10 @@ bool smp_is_main_thread(GlobalContext *glb);
 #define SMP_RWLOCK_WRLOCK(lock) smp_rwlock_wrlock(lock)
 #define SMP_RWLOCK_UNLOCK(lock) smp_rwlock_unlock(lock)
 
+#ifdef __cplusplus
+}
+#endif
+
 #else
 
 #define SMP_SPINLOCK_LOCK(spinlock)
@@ -287,8 +291,4 @@ bool smp_is_main_thread(GlobalContext *glb);
 #define SMP_RWLOCK_UNLOCK(lock)
 #endif
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif